70387999709 has 2 divisors, whose sum is σ = 70387999710. Its totient is φ = 70387999708.

The previous prime is 70387999609. The next prime is 70387999739. The reversal of 70387999709 is 90799978307.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56428577209 + 13959422500 = 237547^2 + 118150^2 .

It is a cyclic number.

It is not a de Polignac number, because 70387999709 - 2³² = 66093032413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70387999739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35193999854 + 35193999855.

It is an arithmetic number, because the mean of its divisors is an integer number (35193999855).

Almost surely, 2^70387999709 is an apocalyptic number.

It is an amenable number.

70387999709 is a deficient number, since it is larger than the sum of its proper divisors (1).

70387999709 is an equidigital number, since it uses as much as digits as its factorization.

70387999709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54010152, while the sum is 68.

The spelling of 70387999709 in words is "seventy billion, three hundred eighty-seven million, nine hundred ninety-nine thousand, seven hundred nine".